﻿/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2009 Frederico Caldeira Knabben
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses at your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * Plugin: automatically resizes the editor until a configurable maximun
 * height (FCKConfig.AutoGrowMax), based on its contents.
 */

var FCKAutoGrow = {
    MIN_HEIGHT : window.frameElement.offsetHeight,

    Check : function()
    {
        var delta = FCKAutoGrow.GetHeightDelta() ;
        if ( delta != 0 )
        {
            var newHeight = window.frameElement.offsetHeight + delta ;

            newHeight = FCKAutoGrow.GetEffectiveHeight( newHeight ) ;

            if ( newHeight != window.frameElement.height )
            {
                window.frameElement.style.height = newHeight + "px" ;

                // Gecko browsers use an onresize handler to update the innermost
                // IFRAME's height. If the document is modified before the onresize
                // is triggered, the plugin will miscalculate the new height. Thus,
                // forcibly trigger onresize. #1336
                if ( typeof window.onresize == 'function' )
                {
                    window.onresize() ;
                }
            }
        }
    },

    CheckEditorStatus : function( sender, status )
    {
        if ( status == FCK_STATUS_COMPLETE )
            FCKAutoGrow.Check() ;
    },

    GetEffectiveHeight : function( height )
    {
        if ( height < FCKAutoGrow.MIN_HEIGHT )
            height = FCKAutoGrow.MIN_HEIGHT;
        else
        {
            var max = FCKConfig.AutoGrowMax;
            if ( max && max > 0 && height > max )
                height = max;
        }

        return height;
    },

    GetHeightDelta : function()
    {
        var oInnerDoc = FCK.EditorDocument ;

        var iFrameHeight ;
        var iInnerHeight ;

        if ( FCKBrowserInfo.IsIE )
        {
            iFrameHeight = FCK.EditorWindow.frameElement.offsetHeight ;
            iInnerHeight = oInnerDoc.body.scrollHeight ;
        }
        else
        {
            iFrameHeight = FCK.EditorWindow.innerHeight ;
            iInnerHeight = oInnerDoc.body.offsetHeight +
                ( parseInt( FCKDomTools.GetCurrentElementStyle( oInnerDoc.body, 'margin-top' ), 10 ) || 0 ) +
                ( parseInt( FCKDomTools.GetCurrentElementStyle( oInnerDoc.body, 'margin-bottom' ), 10 ) || 0 ) ;
        }

        return iInnerHeight - iFrameHeight ;
    },

    SetListeners : function()
    {
        if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG )
            return ;

        FCK.EditorWindow.attachEvent( 'onscroll', FCKAutoGrow.Check ) ;
        FCK.EditorDocument.attachEvent( 'onkeyup', FCKAutoGrow.Check ) ;
    }
};

FCK.AttachToOnSelectionChange( FCKAutoGrow.Check ) ;

if ( FCKBrowserInfo.IsIE )
    FCK.Events.AttachEvent( 'OnAfterSetHTML', FCKAutoGrow.SetListeners ) ;

FCK.Events.AttachEvent( 'OnStatusChange', FCKAutoGrow.CheckEditorStatus ) ;
